code: def vertex_column_size(self):
      return len(self.implementation.col_names)
  
file_path: cugraph/python/cugraph/cugraph/structure/number_map.py
imports: from collections.abc import Iterable
  import dask_cudf
  import numpy
  import cudf
  import warnings
label_desc: Use image node_id 11 for calling the NumberMap obj's underlying member method code with example usage: obj.vertex_column_size() and returns: len